Safety precautions
18
• The polished ends of the fibre are very sensitive to dust and dirt. Ensure that they
are protected at all times. If they should need to be cleaned, a soft cotton cloth or
lens tissues may be used, with a little alcohol if necessary. Never touch the ends of
the fibres with your fingers, and do not use fabrics containing synthetic fibres for
cleaning.
• Never couple two fibre-optic cables without first ensuring that the ends are perfectly
clean. In a threaded connection between two such cables, the ends of the fibres are
no more than a few micrometres away from each other. Dust and dirt, which may
have slipped in between the connection, can easily damage the ends of the fibres.
• Never touch the reflective surface of the mirrors. The surface coating is very sensi-
tive.
4.2 CU004/CU007
• The unit should be connected to a 120 V
AC
or a 240 V
AC
mains. Before installation,
ensure that the mains voltage selection switch (item 10, figure 3.2) is in the correct
position. Also check that the fuse is the correct one.
• The calibration unit should be installed vertically, typically on a wall.
• Do not position the unit close to radiators, heating elements, ventilation blowers or
in the vicinity of strong electrical or magnetic fields. Do not expose the unit to direct
sunlight or to dust, moisture, rain or physical impact.
• Do not connect or disconnect any cables and/or contacts without first switching off
electrical power both at the calibration unit and at the gas analyser.
• The calibration procedures require handling of gases and substances which may be
toxic or flammable. Good knowledge is required about their handling.
• Gas cylinders must be prevented from falling by means of chains.
• The cylinders should be stored in ventilated, specially provided, storage areas. Tox-
ic or flammable gases should be handled in outdoors. Small quantities can be han-
dled inside a building, but then only under a well ventilated hood. In any case,
follow the supplier's instructions.
• All fittings must be in good conditions. A pressure regulator must be inserted be-
tween each gas cylinder and the corresponding valve. The input pressure to the
valve must never exceed 3.5 bar (50 psi)!
IMPORTANT: Before handling any gas or solvent, always study the supplier's safety
instructions and the regulations carefully.
Note: It is important that the gas calibration system is vented to the outside. Also make
sure that the gas system is free from leaks.
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